1. American Book Prices Current [1894-2004]. Bancroft-Parkman, 1895-2005.
2. Anonymous. The Ballantyne Press and Its Founders 1796-1908. Hanson, 1909. Accessed 19 September 2023, https://www.gutenberg.org/files/70869/70869-h/70869-h.htm.
3. Baker, William. George Eliot and Judaism. The Edwin Mellen P, 1975.
4. Baker, William. The George Eliot-George Henry Lewes Library: An Annotated Catalogue of Their Books at Dr.Williams’s Library, London. Garland, 1977.
5. George Henry Lewes’ Diary for January–March 1871